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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91cffe6b33031f3dc890371fbc86b9f70a7fd412634cdbc32faa98a8e8e694e8' 
  AND token = 'rj9ZfnQisqps6LAkjzt3Lq+ccuHw+X3wNs3YJlv1rzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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