Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adec38c1d2057fe2a4e34b550a9242ac7c0c27423f23ee087ef8d2c2ccbbbdb' 
  AND token = 'BThHe8sTNl5bMOUpSW63Lj0nDO7no/HLxGLSPMMvYbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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