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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '583f8a271cd644199e5cac4dc744645cd6aa055717c5ad761ad314565a23a408' 
  AND token = 'suH5GcWTLRKAqnqe7A0ATMtQk2f68FElonkZPdoV5Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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