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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d89afa2fb1a85ff997baea51949dfe1a42bb77d3b15ace4949f6a1766c61b6e' 
  AND token = '5lxs053aAVED5jnxEo7QlX4EHWJD0XXV6R1UAp3Sdic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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