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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c756ae28e9e70b4cc2c4fb0534b145af49aaccfaea5820d0af59a1004393a8c4' 
  AND token = '+zhCGHcw7s/JtBc4wmP1TY9oO5Ie4aQUuHhsYOzu5a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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