Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9f0c3f9828fde85dc4a5856b75503769117a01c798795139c78df38be48fe3' 
  AND token = '3EXeLVJLlcNM6XNHY/FGTtT7GLpTGU/JkzQLDwsFglY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}