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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2b2f5542d4792b470368e192161bc3634cead1bde8be6fb3d03929a16ba6cc9' 
  AND token = 'jxIliyZmh/Qw4uk0eyrpPPlwLbTFt7P7sZ/GdTAmTlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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