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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba9c8bbfbb710414c8cf554c196dede03a1479f124258e1dcb5683e1f89e7729' 
  AND token = '2SYwNFjEEbWX763P0QXuMw9h8PDT+AEJOh23JV4tjVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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