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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84ba9aa1279710a2ac9379d7c24b61aa2e92abde8ae634f9b6109044e511944d' 
  AND token = 'ojtputzIdIsP0cubShNjip+I3pKwhRnP0Sznzz8O2YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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