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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e6d63b29d6b3c5c1c94b31e7ec6ee18cb1bbc3cd3e8c67b402415f3152cbffb4' 
  AND token = '2kMKWG3bUU8b7c0iBpquqCqe4j25PvouzWsUjeasCX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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