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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '075686c464a630b9c1b8ad220bd53af8b9dddb3dab48c781dced7afdd8fbc59f' 
  AND token = 'dA/9FnV0UlmxdTIfB5PI4d91zySppsEdLwEITnlkv5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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