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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7fed3cf1e2cb1d2ff11813e3a803d90c795c80c7fa706a453f80bad661e5b8f' 
  AND token = 'qzGRNdoj0u0d6Fl7vfEkvtXAoMGf3b9IJB0Nh0LZktM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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