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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'adbadc3237b6c3820ae2e4e5bdeb7272c929481a921326346e6c2df811eb947a' 
  AND token = '63kZSBc6SNBKtqJNFbuEWgyjxBIS3H5odbWJjjSuaxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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