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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ef6a5f01d7de73eacdcfc8c29e3916a1c576b366c9ea208645364bc1aed7d3d5' 
  AND token = '027E5+cYUHvW6QOJGWL23V7L5fixwf7NMD46I7T9Ojg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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