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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1fcc029a5b8c7655822443428ecc0cc7bcb8376bf4d4b4de501a88bbbdc86a54' 
  AND token = '8R+zUNC3hdOK/+oR3Xm+W0V487dOqE7UOO+3HDuS2XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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