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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92162267fc4f24f3e9ed3beaf46a9a28ddffc9d353a8f2207314af832b1e6963' 
  AND token = 'WQTFYQYBIXg/kawTEVrF6iIiR+6yfbDfsQCW5I7G9u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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