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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b3e912fcc74a5fbdb516ac1203e8e61c3cc056e4476c5cb0a979ce4aad4f820' 
  AND token = 'zfQemmbk3CoqL6pUEltFeKbriyuzgyjSgr/E2H/bYWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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