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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e28dd3aa941d1616546dbbf25e2f98c83417af0aa4c569dbbe1659c80cac70a8' 
  AND token = '3do/y9VXQXWH39Q+coLcoautRwotGGiC+Jcykq3ZLcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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