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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a7fcc41881a837d23c1e3798bbf58f1b9cd7579814782267bf987534361e6db' 
  AND token = 'ufkuxh4x1LY8R3yTotR7h4diLJcrwDFpV7su0jOF5Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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