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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '756c826344c9cca6c47d28286929c428018322be5d4898fb5f5cf9c4eaf8c9c1' 
  AND token = 'dyKPN/hnO6oxvFpyLsy6TOntO+ux4pVRApWyU4D21yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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