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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea64fb9707734cbd1e152e8f1b0887762dc361341706dcd14ef84b3d61ad1ea6' 
  AND token = 'KqtctdNShcGFBkNdCfQiDxS5+B8Z9yQ0zg8iosvN39Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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