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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80257a020af246d59e5ea756690934c3d0e917979e32f3439cbf7b4c01e7a9f5' 
  AND token = 'aPzzWwbNk2HC3Np4mogKUhLT2KoEuHa8YihTxw3aZTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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