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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'be3884e2c5144ed908a9bc76ebe276028caa4006edea2a44c42894600bbdc4a5' 
  AND token = 'W/74Bf3GW2EpMjwnAA/Zf1RIpJMVoU/lcDhcjV9cLoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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