Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17f78ce7cc4b010866c2ce2d2c46fd7eb584cf8aac7633eac83390ec28b0e15' 
  AND token = 'Ao4EVY7fmrd7WUbX7S27RCVaqFo0sU7qiTnqTdkAFTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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