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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f58cd816086e5bab894bced585bc819c23b70d57f70042d59517b0aa7aac304' 
  AND token = '1ezs4vmMokcEOzobWUsgoynYXqi8Bm3zfssbI5npI/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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