SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '923b78e189834e896243c1169010405a92bdf5c39336a9d35fff6fcf12d642a0' 
  AND token = 'xFTfhpBioaXqP/vPxibhY6G+WSXMz84c9JheAKn1Fvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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