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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ebb9ab433f5da79c351de7b07c9ba5b8aaf7e6da1132baa250065d2083e00d49' 
  AND token = 'Hby3AJU7BImAlmnU25jk6f/3c4C+djJO67v4vhbMy4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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