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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d874feaf75133ac6b5c10be736817fb1e8fd45241025a7020711f41177613b6' 
  AND token = 'OSfMxcyw3MlsExge81X1dG7atxb+7nmaBKZV3rhGnik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01144

JSON explain

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