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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bab3a58d0e91bd45eec1b9d70c28aa6a7a536e2a18122707eea3e563f0a355fe' 
  AND token = 'iKrTPShbnLdqs4PQtzPoz64pDC1p5J6cah+LiHgKbpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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