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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98f1474ca37b254123e81ba2e27ef7e295425ea66729440b728afed836b95ff5' 
  AND token = 'bVFaB3FPBcsCKLoy3uz/CRZEjjo9esy/FGR34/ZNZAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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