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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '590099da2121960f99c05b4625c2a7edee1d8755f9686339fbc94e76e49b6741' 
  AND token = 'Z1MU+zZtuko6nLdNH4Dm0s2H9eQXfTOGAahjfxZ3i+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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