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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a0e1a3674db6611b6e029412c9dc8caf8ad295f1812ba722b181c83faef5bb6' 
  AND token = 'r+fPVtEQgeVpUjTTw9Nkrs6enRhVTjSj+8eg16Z63qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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