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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1cd43eaa0503e71098db017b6f5ce865478cb9a33fab9a7a97cdcf86e101aab4' 
  AND token = 'RsPaUrwRIGNkQT/E8Fsg95b6a5/TezjxgR+4WABjmCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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