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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f298cabcb34f56ec22d4d3e78bead88b0cf324385e723896a5f4b1f85891a394' 
  AND token = 'K67SI1V6IBmDdeA7iBpCOYjm85+MDYdPsJkMb7suy7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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