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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '501bf745fba1e358e5d3ee2b66e0796e1bd4424302093212d3dc0a30d0491558' 
  AND token = 'dhPfgWScXq7t8wTu3gp/ThYnbs9B7dwsoDEhYBHaqWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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