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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1717a7a563791bc4bc903d52bb688e60bbb6db74323afd95f6a51136b7de72ab' 
  AND token = '2bVRpgB97GEl3R/jSqEvU9UF9Omr3eLqEp8xgpGMoUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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