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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa7779793e54a25fe674cc2d20aaead5de5c1e2792c78367e0700519a3e0b3c1' 
  AND token = 'n+Mn5IA5Ox+Rk9cyHT7j6K+P+Ip2CLNXR7jwTbcE3IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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