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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a87e67630428471739ca3ec568f154ebe3abae65bf618b77d84709e1619d5d1' 
  AND token = '1amDDghQhV37WJ3MqnI/crQSMzIwcqGt6BDH0zQeW0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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