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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9585796196ae1a856d4f62c025253bec117274af7bf5c6cf574ea4c0f70a1a8f' 
  AND token = 'dtso1wcyhVobrzW29LwYqw/0otYeaw8dUqqqxNNNiq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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