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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7adcadca7e5b125b9e11127a966458c52953738b804afb09dddcddd4dc04c3e1' 
  AND token = 'mZnTTvKBwtvbexTYU+ygMpEdELEnmghHt6IsA9FcQgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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