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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32fa6e972d6db4f042451d860ec6242540f8c40e7948921d6838711eecdc96cc' 
  AND token = 'ocijfcFH8BIyChM5i9+UoIEhmsZbWulZQmGQwkR9UFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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