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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9230e6629e1689304a9a76fee6b31fbe00cab5974554412980284adb4973ebb3' 
  AND token = 'SA/MANv6+7uaFl+7yvdSLG7mXwY5XM1CS9N8OYK4LMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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