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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e049a60f2172ea94fca06414be218e5d014c7194841daace08ecc53033bc777' 
  AND token = 'IrVWCsbJ+jjXsQ0KE4iv/cpXHE/pTUZpRXrlQGv8YeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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