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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84ceee4f0de9f6189e80a6a5cdf97e56ac33c49c788e0b7705636c379eb23d22' 
  AND token = 'sPUeZ5+gM01pcxVAhT18x6kyDd/mr5yM6Abgs4I4i7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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