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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '182fbd0df5d3b84d67a2cd49d495747f0f1328a7084f3942c981236b7548c7cf' 
  AND token = 'cbAfd5+6po8y9hZmy1tA6Br0r/ec6y4GcvO70Em5m9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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