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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ac836e21189ab54761900fd1e54c759c65c845881095ac26d9b55712755c88e7' 
  AND token = 'jAKvjMDIZ02mEN6tMAG+328P9W2wuQ7jS6Gi3L5WuDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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