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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '370bf20a1ca582c2a38488b2a4fa20472a936d9ea3fda050b27762e429b9e791' 
  AND token = 'KnyyOO9/y20bnTgIaR37BNyY+igCZT+hANJRayIRFVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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