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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc27c5ed41e62b4b438d3f7563aec2c9494d9851729c7c47065f53145028ecb5' 
  AND token = '/seubjqIyiSDG2FZ0owX7TCUHuyWhNAErrsgeuPN4Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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