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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc355cbdff093c4f94b1649a138b1959483714288eca4d1126ecdf60c7419662' 
  AND token = 'HOCgAr6PF2LwGSDe2V6ofcq0f44BCvbgy+hDuco4s74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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