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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ddc1275bc3cb57296bc006ffc8b6189aa93a525cf4303dedbf3c07912c1583b' 
  AND token = '4Vs1ockd7Z0GCi38MdSm/oWLXvMXb4H21WgEdspzYi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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