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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd707ddcff8e48f3adf69c4fd36dd1ae04495912a7fe530e35b0c94df5c29adf5' 
  AND token = 'zsx6YUOheWdrXsRWdoYjaNBqWDkElfBOMsQhKlB+y0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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