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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ebeff9a960b543c59fe5959876348e3eeb4957d56ac468636f30a258acaa332' 
  AND token = 'K9EoE4qG2DQMjRjbkh+p0nWC65lG1qDiagQ2iWDMnVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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