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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '43286311c07c858ef49336027ba53adb0fc5ca59c18c47a2570d098e46075dc2' 
  AND token = 'Fk/HkOmuP5SQcOkn2abQcF4MqxAC4XWr/itfBwR6GUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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