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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3eec70db998e19405f0399f6a5fdf237fd6f3d374f2b208203d66eceb7332c04' 
  AND token = 's09qcJEjHu5dn4Mc8+jWClQlKvUCtS+6utSdkxDAc1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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