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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fffa6b97756240aa8f204f2c7d97ca7a7813801af7342dcbb79cd0323656548' 
  AND token = 'oQ8CqPD5IpT5U7QAd25IkbP7a046U6CtECawLzvItZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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