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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '346d29b67f7e7fc37ed543a718948cd164c5de6a0005f57135d7d6ddae66cfc0' 
  AND token = 'OTMPyZfj8eAmiXWEsJdSYbYxkSOeF1BsJ99iOxorwuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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