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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dad5e99b1ca901f9b7ff5a344999916b52a8c9bc3037c7fb5130f1a7c8090ce6' 
  AND token = 'mY3By/MqHtXftZvq1/4vPimdLinySqeuluDo6GTuzDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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