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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91e1e3b9b611fa427a13ffda18632740dac9aeea00286c18bbcb340a8936b91e' 
  AND token = '5xkTyYyUja0t/biW+UswR1N7X5tgWI16GP5WBg49V/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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