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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1a93d27b6b784c00e7c91b4eb16c34d5e4235e111ecef92e09062eb111408211' 
  AND token = 'RAr43ixWAa83CYdGF+hWUK/RfUNwJsuqy9W3g8bPcDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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