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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1538e78787725370b18ae2d940c7351a9d5a7251f537473a9de50f094462abb' 
  AND token = 'bBfK9VA3kxZYeISnXcHl1DF3zO1VDjyeoduKg9OB4bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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