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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '022bbd83f80bd48daf455d041499a39e4d01aea2d170c6d8e3e39c66dc2399e0' 
  AND token = 'RyJNTqR+y21neZk6Oc+Mrm+iZOFuc3Chc/dFMtAbMwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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